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梁山煤田从1983年开始进行普查钻探。该地区第四系、第三系地层较厚，一般为500～600米。第四系地层为砂质粘土或粘质砂土，并含有砾石层，岩性松散，稳定性很差，水敏性强，遇水膨胀缩径，砂层易坍塌；第三系地层主要为风化泥岩、风化砂岩及中粗砂岩。砂岩无胶结性，泥岩成岩作用极差，有的钻孔夹有大于1米的流砂层及厚薄不均的石膏层，稳定性差，水敏性强，易坍塌、缩径，泥浆易被钙浸。梁山煤田钻孔普遍存在缩径、坍塌、掉块及下钻下不到底等现象，由于钙浸问题未解决，往往孔内遇到较厚的石膏夹层，或含石膏较多的泥岩层，泥浆性能变坏，而造成孔内事故。如0/ZKI孔曾因孔内缩径，
Yangshan Coalfield began census drilling in 1983. Quaternary and Tertiary strata in this area are thick, generally 500-600 meters. Quaternary strata are sandy clay or clay soil, and contain gravel, loose lithology, poor stability, strong water sensitivity, water expansion and contraction diameter, sand collapse easily; Tertiary strata mainly Weathered mudstone, weathered sandstone and medium sandstone. Sandstone without cementing, mudstone diagenesis is very poor, and some holes sandstone layer is more than 1 m thick and uneven thickness of the gypsum layer, poor stability, water sensitivity, easy to collapse, diameter, mud easily Ca leaching . In general, drilling in the Liangshan coalfield is shrinking, collapsing, dropping and under-drilling are not the most common problems. Due to the problem of calcium leaching, the gypsum interlayer is often encountered in the holes or mudstone layers containing more gypsum, Performance deterioration, resulting in hole accidents. Such as 0 / ZKI hole has reduced due to the hole,